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1.
Ray JG Ghosh R Mallick D Swain N Gandhi P Ram SS Selvaraj S Rathore A Mathummal S Chakraborty A 《Biological trace element research》2011,144(1-3):295-305
In order to ascertain possible correlation between alterations in trace elemental profile and the progression or regression of two most common potentially malignant disorders affecting oral cavity, namely oral submucous fibrosis and leukoplakia, blood from 60 patients from each group of patients as well from 30 healthy individuals was analyzed for elemental profiling employing EDXRF technique. Out of the 16 detected elements (K, Si, Ca, V, Cr, Ni, Mn, Fe, Cu, Zn, Se, Br, Rb, Sr, Co, and Pb), Mn, Fe, Zn, Br, and Co showed remarkable alteration in their profile in both leukoplakia and oral submucous fibrosis patients with respect to the normal healthy individuals. While Zn, Br, and Fe reflected similar changes--showing gross depletion in both the diseased groups, Mn and Co depicted inverse pattern of alterations in their concentrations in the two types of precancerous disorders when compared to the control subjects. 相似文献
2.
Serum sialic acid levels and selected mineral status in patients with type 2 diabetes mellitus 总被引:2,自引:0,他引:2
The aim of the present study was to investigate whether altered serum total sialic acid (TSA), lipid-associated sialic acid
(LSA), copper (Cu), manganese (Mn), zinc (Zn), chromium (Cr), iron (Fe), and magnesium (Mg) levels had an interactive connection
with diabetes and also whether they were correlated with each other in diabetic patients. Two study groups (control and type
2 diabetic subjects) were included. Two hundred patients (108 female and 92 male), diagnosed and treated for type 2 diabetes
in the Yuzuncu Yil University Hospital (Van, Turkey), were selected consecutively to represent type 2 diabetic patients. Fifty
healthy individuals (29 female and 21 male) served as the control group matched for age, sex, body mass index, and smoking
status were selected from hospital staff and other outpatient clinics. All participants had not taken vitamin or mineral supplements
for at least 2 wk before sampling. Blood samples were drawn after an overnight fasting in both groups for the determination
of serum glucose, TSA, LSA, Cu, Zn, Mn, Cr, Fe, and Mg. It was found that diabetics had higher TSA, LSA, Fe, Mn, Fe/Zn, and
Cu/Zn levels, and lower Zn and Mg levels than those of controls. Although, Cu levels were higher, and Cr levels were lower
in total and male diabetic patients, they were not different in female diabetic patients than in controls. The Cu/Fe ratio
was lower in total and female diabetic patients, but not different in male diabetic patients than controls. The Zn/Cr ratio,
on the other hand, was not different in diabetics than in controls. There was only a positive correlation between Fe-Mn levels
in male diabetic patients. There was a negative correlation in LSA-Mn, Fe-Cu, Cu-Fe/Zn, and Mn-Cu/Zn levels in total diabetic
patients. There was a positive correlation in TSA-Cr, TSA-Mg, LSA-Cu/Fe, LSA-Zn/Cr levels, and a negative correlation in TSA-Cu/Zn,
LSA-Mn, Fe-Cu, Mn-Cu, Cu-Fe/Zn, Fe-cholesterol, and Cr-cholesterol in female diabetic patients. Our results showed that TSA,
LSA, and selected minerals have interactive connections with diabetes mellitus (DM). There are also many sex-related positive
or negative correlations between the altered parameters in diabetic patients. These parameters might be used as diagnostic
index in patients with DM. 相似文献
3.
Metal determination in human tissues is the most common application of biological monitoring for screening, diagnosis and
assessment of metal exposures and their risks. Various biopsy-materials may be used. This paper deals with the quantitative
determination of Cd, Pb, Cr, Mn, Fe, Ni, Cu, and Zn concentrations in nails of male subjects exposed to these metals alongwith
their respective controls, while working in locomotive, carriage and roadways workshops, and lead battery factories. The levels
of Cd, Pb, Cr, Mn, Fe, Ni, Cu and Zn in fingernails, assayed by atomic absorption spectrophotometry, were compared with their
respective controls by student ‘t’ test. All the obtained values were correlated to the personal and medical history of the
subjects under study. Significantly high levels of Cd, Pb, Cr, Fe, Ni, Cu and Zn were present in smokers, compared to nonsmokers.
The concentrations of Cd, Pb, Cr, Mn and Fe were not significantly high in vegetarian subjects. It was also observed that
there is no contribution of liquor towards nail-metal concentration. Significant correlations were observed between skin disease
and Cr, Mn, Fe, Cu; hypertension and Cd, Mn, Cu; mental stress and Cd, Pb, Mn, Ni, Cu, Zn; diabetes and Cr, Mn, Ni; chest
pain and Pb; respiratory trouble and Cr, Mn, Fe, Ni, Zn; tuberculosis and Zn; acidity and Cd; and ophthalmic problems and
Mn, Fe, Ni, and Zn 相似文献
4.
A. N. Garg Vivek Singh R. G. Weginwar V. N. Sagdeo 《Biological trace element research》1994,46(3):185-202
Influence of trace elements in body metabolism and their physiological importance in various diseases have motivated their
accurate and quantitative determination in biological tissues and fluids. Instrumental Neutron Activation Analysis (INAA)
using short and long term irradiation has been employed to determine five minor elements (Cl, K, Na, Mg, P) and 15 trace elements
(As, Br, Co, Cr, Cs, Cu, Fe, Hg, Mn, Rb, Sb, Se, Sc, Sr, and Zn) in cancerous and normal breast tissue from 30 patients of
four clinical stages. Several elements show enhancement in cancerous breast tissue. Selenium shows maximum enhancement of
94.7% followed by K (81.6%), Sc (66.7%), Cu (58.2%), Na (48.5%), P (44.4%), and Zn (39.2%). Some element, such as Fe, Cr,
and Mn, are depressed by 30.8, 30.1, and 12.8%, respectively. These elements compete for binding sites in the cell, change
its enzymatic activity and exert direct or indirect action on the carcinogenic process accelerating the growth of tumors.
This is further evidenced by histopathological examination of cancerous cells showing poor cytological differentiation. An
attempt has been made to correlate trace element concentrations of Se, Cu, Zn, Rb, Br, Hg, As, Co, Fe, Cr, and Mn and the
ratios of Se/Zn, K/P, Cu/Zn, Na/K, and Se/Fe with the clinical stages of cancer. Inhibition of enzymatic activity caused by
variation in trace element concentrations results in immunological breakdown of the body system. 相似文献
5.
Binggan Wei Lisheng Yang Jiangping Yu Bixiong Ye Xianjie Jia 《Biological trace element research》2013,156(1-3):12-21
Little is known about the link between metals accumulated in human and asbestos fiber contamination in the environment. Therefore, hair samples of 368 subjects (128 males and 240 females) from a rural area contaminated by crocidolite asbestos fibers were collected to investigate the distributions of 17 metals accumulated in human. The results showed that the mean concentrations of As, Al, Ba, Cd, Co, Cr, Cu, Fe, Hg, Mg, Mn, Mo, Na, Ni, Pb, Sr, and Zn in hair of the total subjects were 0.23, 23.36, 4.33, 0.11, 0.05, 0.70, 10.53, 29.74, 0.37, 241.57, 3.52, 0.08, 153.21, 0.72, 4.26, 10.96, and 113.35 mg/kg, respectively. Moreover, approximately 86.14, 52.17, 73.91, 85.05, 80.98, 74.46, and 53.80 % of the hair samples of the total subjects contained much higher concentrations of Al, Ba, Fe, Mg, Mn, Na, and Sr compared with the highest reference values, respectively. The mean concentrations of the determined metals (except for As, Co, Cr, Hg, and Mo) significantly varied among different age groups for both male and females. The results of correlation analysis and cluster analysis revealed that strong correlations were found between Al, Fe, Zn, Mg, and Na accumulated in human from the study area. These might suggest that Al, Ba, Fe, Mg, Mn, Na, and Sr were significantly derived from contamination of crocidolite asbestos fibers. Zn, Mg, and Na might also originate from diet. However, Cd, Mo, Co, As, Cr, Hg, Ni, Mn, Pb, and Ba accumulated in human seemed to be mainly derived from soil. It can be concluded that metals accumulated in human hair have a link with asbestos fiber contamination in the environment. 相似文献
6.
V. P. Grankina T. I. Savchenko O. V. Chankina G. A. Kovalskaya K. P. Kutzenogii 《Contemporary Problems of Ecology》2009,2(4):396-399
The trace element composition of the subsurface (roots and rhizomes), overground (leaves and stems), and reproductive (bean valves) organs of Glycyrrhiza uralensis Fisch. was determined by synchrotron radiation X-ray fluorescence analysis (SRXFA). Concentrations of Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Hg, Pb, Bi, Th, and U were measured. The data obtained were used to estimate the distribution of some elements in samples of various organs of licorice. Glycyrrhiza uralensis is an accumulator of Fe, Mn, Cu, and Co. 相似文献
7.
The accumulation of 11 microelements (Fe, Zn, Cu, Co, Mn, Ni, Pb, Cd, Sr, Cr, and Se) by 7 wild onion species of the genus Allium was studied. A. flavescens Bess possesses the higher accumulating capability; it accumulates five of eleven microelements (Cr, Ni, Cu, Zn, and Se) with biological accumulation coefficient (BAC) exceeding 1 and also contains high levels of Fe, Co, and Mn. These features enable this species to be the most promising for the nutrition adjustment of human commons with above-mentioned microelements primarily with Cr, which content in 100 g onion leaves achieves 84% of commons. A. fistulosum L., A. odorum L., and broad-leaved A. nutans form specifically accumulate Cu, Zn, and Se. A. montanum Schmidt is characterized by the accumulation of Zn. A. angulosum and A. schoenoprasum are xharacterized by the accumulation of Se. The broad-leaved forms of A. schoenoprasum L., A. nutans L., and A. odorum L. compared with their narrow-leaved forms accumulate more amounts of Zn and Cu. 相似文献
8.
Trace element concentrations in body tissues of healthy centenarians have not been widely analyzed, yet they can be used as
reference data leading to improved assessment of the aging process and monitoring of the micronutrient status of this age
group. The present study sought to assess trace element concentrations and behaviors in the fingernails of healthy Chinese
centenarians. The effects of gender on element concentrations, which also play an important role in determining the lifespan,
were also investigated. Trace elements (Ba, Cd, Co, Cr, Cu, Fe, Li, Mn, Mo, Ni, Pb, Se, Sr, and Zn) in the fingernails of
78 healthy Chinese centenarians were determined by inductively coupled plasma mass spectrometry. The overall reference values
obtained in milligram per kilogram are as follows: Ba, 5.10; Cd, 0.031; Co, 0.101; Cr, 0.82; Cu, 3.71; Fe, 154.35; Li, 0.31;
Mn, 3.09; Mo, 0.040; Ni, 0.95; Pb, 1.86; Se, 0.44; Sr, 6.20; and Zn, 147.96. Data analysis showed that only Cr and Se concentrations
show a normal distribution, and no significant difference between male and female groups was found for any element except
Cr. Result also revealed that sufficient Se, Co, and Zn as well as lower or lack of exposure to Cr contribute positively to
the lifespan of centenarians. The results suggest that regulating in vivo contents of trace elements, especially Se, Co, and
Zn, is reasonable to intervene with geriatric diseases. 相似文献
9.
Reference values for trace and ultratrace elements in human serum determined by double-focusing ICP-MS 总被引:3,自引:0,他引:3
Cristina Sariego Muñiz José Luis Fernández-Martin Juan Manuel Marchante-Gayón José Ignacio García Alonso Jorge B. Cannata-Andía Alfredo Sanz-Medel 《Biological trace element research》2001,82(1-3):259-272
Reference values for trace and ultratrace elements concentrations in healthy human serum, measured by double-focusing inductively
coupled plasma-mass spectrometry (ICP-MS), are presented. Blood donors from Asturias (Spain) were selected as the reference
population (n=59). Blood samples were collected, after donation, taking the necessary precautions to avoid contamination. All subjects
analyzed had normal renal function and nutritional status, as shown from their creatinine and albumin levels. A total number
of 14 elements (Al, Ca, Cr, Mn, Fe, Co, Cu, Zn, Rb, Sr, Mo, Cd, Pb, and U) were monitored almost simultaneously. Serum samples
were diluted 1+4 with ultrapure water and matrix interferences were corrected using Sc, Ga, Y, and Tl as internal standards.
Fe, Cu, and Zn were also determined by isotope dilution analysis (IDA).
Reference trace element concentrations intervals observed containing 95% of the reference distribution after excluding outliers
are presented. Fourteen serum samples from hemodialysis patients were also analyzed for comparison. High levels of Al, Cr,
Sr, Mo, Mn, Pb, U, Co, and Cu and low levels of Fe, Zn, and Rb were found in the serum samples from hemodialysis patients
compared to the corresponding reference values observed in this work. 相似文献
10.
The characteristics of the contents of 20 elements (Al, Fe, Mn, Ca, Mg, K, S, Si, P, Cd, Cu, Zn, Ti, Ni, Sr, Mo, Na, B, Cr, V) in 16 plant species collected from the Three Gorges Region in China were investigated. The average contents of Ca, K and Mg were higher than 1 000 μg·g-1, that of Al, P, Si, Fe, S and Mn ranged between 100—1 000 μg·g-1 and Ti, Cu, Ni, Cr, Mo, Cd and V were less than 10 μg·g- 1. The level of Na content was less than that of the reported. The main character of the element contents was of the Ca> K type. The contents of P, S, Ca and K in different plant samples showed a normal distribution pattern, while Al and Mn showed a elements lognormal distribution pattern. Plant species differed greatly in the element contents. On analyzing the coefficient of variation (C. V., % ), Al, Mn, Mg, Ni, Sr and Fe had higher C.V., while the C.V. of K, S, P, Cr, Cd and Cu was less than 60%, and Cu had the lowest C.V. The correlations between Al and Fe, Al and Ti, Al and Cr, A1 and V, Cd and Sr, Cd and Mo, Fe and V, Zn and Cr, Ni and Sr, Mg and Ni, Mo and Sr, Ca and Sr, Cr and Mo, Na and Mg, Na and P, P and S were statistically significant in different plant species. The classification of the 16 plant species and 20 dements by two-way indicator species analysis (TWINSPAN) method may suggest the difference in dement contents of the different plant species. 相似文献
11.
Paiva R. P. Munita C. J. S. Cunha I. I. L. Romano J. Alonso C. D. 《Biological trace element research》1990,(1):231-242
Two nuclear techniques, Energy-Dispersive X-Ray Fluorescence Analysis (EDXRF) and Instrumental Neutron Activation Analysis (INAA), were used to analyze aerosol samples collected in the city of São Paulo, Brazil. Na, Cl, Mn, V, Al, Sm, Mo, W, La, As, Br, Sb, K, Ba, Se, Th, Cr, Rb, Ca, Fe, Ce, and Sc were determined by INAA, and Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, As, Se, Br, Rb, Sr, Hg, and Pb were determined by EDXRF. A preliminary identification of the main source of the atmospheric aerosol was performed based on enrichment factor and correlation coefficient calculations.
相似文献12.
The rangelands of Stipa tenacissima and Lygeum spartum (Poaceae) constitute one of the main typical ecosystems in the Iberian Peninsula and North Africa. This study examines the seasonal changes in aboveground biomass accumulation and translocation of some major (Ca and K) and trace elements (Br, Cr, Cu, Fe, Mn, Sr and Zn) from topsoil to shoots of these perennial grasses. Species, season and their interaction significantly affected the dry biomass (DW) and chemical composition of both species and their surrounding soil. The maximum DW was found in spring due to high physiological activity and was correlated positively with rainfall. A significant relationship between seasons and chemical elements was found. For both species the maximum concentrations of Ca, Cu and Zn were found in spring season. However L. spartum had the highest concentrations of K, Cr, Br, and Sr in autumn season, indicating exceptional ability of these species to accumulate large contents of these elements during the active growth periods. By way of contrast, in the topsoil the highest concentrations of almost all chemical elements were found in summer and autumn. Principal component analyses (PCA) showed that growth of L. spartum was highly associated with K, Ca, Zn, Br and Sr, whereas topsoil was correlated with Cu, Cr, Fe and Mn concentrations. Translocation factor (TFx) of chemical elements was not identical across the two species, demonstrating inter–specific variability to uptake chemical elements. The maximum values of TFx were recorded for K, Ca and Sr especially for L. spartum. To cope with arid conditions, S. tenacissima and L. spartum sprout quickly by increasing their rate of growth and nutrient uptake as soon as soil water is available after the rain. 相似文献
13.
M. Peltomaa K. Mattila J. Wolf M. Hyvönen-Dabek 《Biological trace element research》1992,34(3):249-255
The trace elements of both calcified atherosclerotic plaques and plaque-free vessel walls of the carotid bifurcation from
31 autopsies were investigated using the proton-induced X-ray emission (PIXE) method. The trace elements studied were phosphorus
(P), calcium (Ca), chrome (Cr), iron (Fe), copper (Cu), zinc (Zn), lead (Pb), selenium (Se), bromine (Br), strontium (Sr),
and rubidium (Rb). All samples contained Fe and Zn. Mercury (Hg) was not detected in any of the samples studied. All plaque-free
samples contained Cu and almost all Br and Ca, none Sr. All calcified atherosclerotic plaques contained Ca and almost all
Br and Sr. The relative levels of Ca were higher in the calcified plaques than in the plaque-free vessel walls. The relative
value of Ca in calcified and uncalcified samples was greatest in the group who had died because of cardiovascular disorders
and smallest in the group who had died from other causes. There was a strong positive correlation between the Ca and Sr of
the plaque samples and between the P and Br of the plaque-free samples. 相似文献
14.
The concentrations of 19 trace element in hair samples from 1273 residents of Harbin (China), Medan (Indonesia), and Tokushima
(Japan) were measured by inductively coupled plasma emission spectrometry. The mean concentrations of Ba, Ca, and Se were
significantly higher in the Harbin hair samples when compared to those from Medan, but Al, B, Cu, Fe, Mn, Na, Pb, Ti, Zn,
and K were significantly higher in Medan than in Harbin hair samples. The differences in the mean concentrations of As, Cr,
Mg, P, Sn, and Sr between the Medan and Harbin lots were not significant. In the Tokushima hair samples, Na and K were significantly
higher, but As, B, Ba, Ca, Cr, Mg, Mn, Pb, Sn, Sr, and Se were significantly lower than in the Harbin hair samples. The differences
in the mean concentrations of Al, Cu, Fe, P, Ti, and Zn between Harbin and Tokushima were not significant. In the Medan hair
samples, Al, As, B, Ba, Ca, Cr, Cu, Fe, Mg, Mn, Pb, Sn, Sr, Ti, and Zn were significantly higher, but P and Se were significantly
lower than in Tokushima hair samples. Differences in mean concentrations of Na and K between Tokushima and Medan were not
significant. 相似文献
15.
Qaisara Pasha Salman A. Malik Nazia Shaheen Munir H. Shah 《Biological trace element research》2010,134(2):160-173
Trace elements including Al, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, Sb, Sr, and Zn were analyzed in the scalp hair
samples of women with malignant breast lesions, women with benign breast lesions, and healthy donors using atomic absorption
spectrophotometric method. In the scalp hair of malignant-tumor patients, the highest average concentration was shown by Ca
(1,187 μg/g), followed by Na (655 μg/g), Mg (478 μg/g), Zn (391 μg/g), Sr (152 μg/g), Fe (114 μg/g), and K (89.8), while in
the case of benign-tumor patients, the average estimated element levels were 1,522, 1,093, 572, 457, 217, 80.4, and 74.7 μg/g,
respectively. Most of the elements exhibited non-normal distribution evidenced by large spread, standard error, and skewness
values. Mean concentrations of Ca (634 μg/g), Zn (206 μg/g), Mg (162 μg/g), Fe (129 μg/g), and Na (82.1 μg/g) were noteworthy
in the scalp hair of healthy women. Average levels of Na, Sr, K, Cd, Co, Pb, Mg, Ca, Zn, Ni, Sb, and Mn were revealed to be
significantly higher in the hair of malignant and benign patients compared to the healthy women; however, Fe, Cu, Al, and
Cr were not significantly different in the scalp hair of the three groups. The quartile distributions of Ca, Cd, Co, Cr, K,
Mg, Mn, Na, Ni, Pb, Sb, and Sr revealed maximum spread in the scalp hair of malignant and benign groups; nevertheless, Al,
Cu, Fe, and Zn exhibited almost comparable quartile levels in the three groups. Strong correlation coefficients were found
between Fe and Cd, Al and Na, Mn and Sr, Co and Cr, Cd and Cr, Pb and K, Pb and Mn, Cu and Na, and Al and Fe in the scalp
hair of malignant-tumor patients, while Fe and K, Cd and Co, Na and Co, and Cr and Pb showed strong correlations in the scalp
hair of benign-tumor patients, both of which were significantly different compared with the healthy subjects. Multivariate
cluster analysis also revealed divergent clustering of the elements in the scalp hair of malignant and benign patients in
comparison with the healthy women. 相似文献
16.
Hair samples of 655 children (3–6 yr of age) from metropolitan and small cities in Korea were analyzed to determine the content
of 23 minor and trace elements with the aim of assessing reference values. Fifteen essential elements (Fe, Zn, Cu, Ca, Mg,
Mn, P, Na, K, Cr, Se, Li, V, Co, Mo) and 8 harmful elements (Pb, Al, Hg, As, Cd, Ba, Bi, U) were taken into account. Measurements
were performed by inductively coupled plasma-mass spectrometry. The overall mean values were as follows (μ/g): Al, 8.78; As,
0.11; Ba, 0.32; Bi, 0.04; Ca, 212.47; Cd, 0.08; Co, 0.01; Cr, 0.47; Cu, 15.51; Fe, 12.62; Hg, 0.49; K, 34.10; Li, 0.01; Mg,
12.29; Mn, 0.29; Mo, 0.07; Na; 27.14; P, 121.21; Pb, 1.68; Se, 0.75; U. 0.04; V. 0.08; Zn, 69.99. There was no significant
difference in hair mineral content between children living in metropolitan and small cities. There were positive correlations
between age and the level of Zn, Ca, Na, P, Mn, and Li, but negative correlations between age and the level of Cr, V, and
U. The proposed reference values for hair Zn, Mg, Ca, As, and Cd of Korean children were lower than those of other countries,
but the values for other elements of hair were not significantly different from those of other countries. 相似文献
17.
Biology Bulletin - Abstract—A comprehensive atomic-emission study and comparative assessment of the content and distribution of heavy metals (Mn, Cu, Cr, Al, Fe, Zn, and Sr) in the organs and... 相似文献
18.
Asano K Suzuki K Chiba M Sera K Matsumoto T Asano R Sakai T 《Biological trace element research》2005,103(2):169-176
The influence of hair color on the trace elemental status in horse's hair has been studied. A current analytical technique
such as particle-induced X-ray emission (PIXE) used in this study has provided reliable, rapid, easy, and relatively inexpensive
diagnostic methods. Twenty-eight elements (Al, Br, Ca, Cl, Co, Cu, Cr, Fe, Ga, Hg, K, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, S,
Se, Si, Sr, Ti, V, Y, and Zn) in mane hair were detected by the PIXE method. The gray hair contains significantly greter amounts
of Cu, Ti, and Zn, and lower amounts of Br, Ca, Se, and Sr than those in other colored horse hairs (p<0.05). Those results measured in the horse's hair were similar to those found in human and dog hair. When interpreting a
result, it should be kept in mind that hair color, especially gray hair, influences the concentrations of some elements in
horse hair. 相似文献
19.
Akanle O. A. Akintanmide A. Durosinmi M. A. Oluwole A. F. Spyrou N. M. 《Biological trace element research》1999,(1):611-616
Proton-induced X-ray emission (PIXE) has been used to obtain the concentrations of 11 elements (P, S, Cl, K, Ca, Fe, Cu, Zn,
Br, Rb, and Cd) in whole-blood samples of 16 hypertensive subjects (mean age: 52.5 ± 0.5 yr) and 18 age-matched controls (mean
age: 51.5 ± 0.5 yr) in a Nigerian population. The results of the study indicate that the hypertensive subjects have significantly
higher mean concentration of Cl, Cd, Cu, and Zn when compared with the controls, and the mean concentration of P, K, and Ca
was found to be significantly lower in the hypertensive group in comparison to the controls. Furthermore, the Zn : Cd ratio
was found to be significantly higher in the controls than in the hypertensives, and the Cu : Zn ratio was significantly higher
in the hypertensives. 相似文献
20.
S. A. Tarafdar S. Akhter S. Kar S. K. Biswas A. H. Khan 《Biological trace element research》1987,12(1):121-131
Proton-induced X-ray emission (PIXE) method was employed to study the concentration of heavy elements in betel leaves, betel
nuts, and mineral lime consumed in Bangladesh. The samples were collected from different parts of Bangladesh and analyzed
by the thicktarget external beam technique of the PIXE method. The samples were exposed to the proton beam as 1-mm thick pellets
and irradiated with 2.0-MeV protons having 20-nA beam intensity. The concentration of some 15 elements (K, Ca, Ti, V, Cr,
Mn, Fe, Ni, Cu, Zn, Se, Br, Rb, Sr, and Pb) was measured by comparison with a calibration curve constructed from the NBS orchard
leaf standard SRM 1571. The validity of the procedure has been established by comparative measurements of Cu and Zn with atomic
absorption spectrophotometry. The significance of the results is discussed in view of their implications in health and disease. 相似文献